My 2003 jeep grand cherokee laredo (automatic)will not change from 3rd gear to 4th. When Im trying to enter the interstate, as I reach speeds of 60mph, the check engine light will blink and car will start jerking. Also the jeep will turn off when stuck in 5mph traffic. I feel this is all related. HELP?

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Sunday, September 9th, 2012 AT 2:45 AM

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ASEMASTER6371

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25,554 POSTS

We need the codes.

From your description, you have engine missfires that may require plugs and coils.